It is possible for F2P players to obtain UR ninjas, though it requires strategic saving and "a little daring" in summoning. Resources:
Solo play is painful. Join an active guild on Day 1. free account ninja heroes new era
A free account—especially one that is "given away" by retiring players—usually comes with pre-unlocked characters and banked Gold, giving you an immediate edge. How to Find a Free Account for Ninja Heroes New Era It is possible for F2P players to obtain
If you are fortunate enough to claim a free account from a giveaway, you must verify its quality immediately. Do not accept garbage. A valuable free account for Ninja Heroes New Era should include the following: free account ninja heroes new era